Force exerted by a agitated fluid on vessel wall

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Discussion Overview

The discussion revolves around calculating the pressure exerted by an agitated fluid on the walls of a non-pressurized vessel. Participants explore various factors that may influence this pressure, including the nature of the agitation and its effects on vessel design.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant seeks to calculate the resultant pressure on the vessel walls to determine the necessary thickness for safety.
  • Another participant requests more details about the problem to provide a more informed response.
  • Some participants suggest that minor agitation may not significantly affect the vessel, proposing that it could be designed primarily to support the mass of the liquid with a safety factor.
  • Concerns are raised about extreme accelerations and decelerations affecting the vessel, with a suggestion to consider G forces in such cases.
  • Discussion includes the potential impact of vibrations on the vessel, highlighting the need to consider fatigue and resonance issues.
  • One participant mentions surge loading as a manageable issue but requests clarification on the design specifics.
  • A later post reiterates the need to calculate pressure and asks about critical areas of concern in the vessel, suggesting that calculations might involve wave analysis, hydraulics, and the water hammer effect.

Areas of Agreement / Disagreement

Participants express differing views on the significance of agitation effects on the vessel walls, with some downplaying its impact while others emphasize the need for careful consideration of various factors. The discussion remains unresolved regarding the best approach to calculating the pressure and identifying critical areas of concern.

Contextual Notes

Participants have not reached a consensus on the specific methods for calculating pressure or the critical areas of the vessel that require attention. The discussion includes assumptions about the nature of agitation and its effects, which may vary based on the specific design and operational conditions.

billy_boy
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How can I calculate the pressure exerted by a fluid on the walls of the vessel that is being agitated. The vessel is not pressurised. I have to calculate the resultant pressure on the walls to calculate the thickness of the vessel walls.
 
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Please describe the problem in more detail .
 
Minor agitations won't do much to the vessel. Might as well just design it to hold the mass of the liquid with a sensible factor of safety.

The only way I could think of, that the agitation of liquid could have a reasonable effect on the walls of the vessel is if you are making it undergo quite extreme acceleration and deceleration (is the vessel on hydraulic jacks or something?). Then, perhaps you could simply consider the G forces.

If the agitation is in the form of vibrations, it's a different story altogether, as you have to start looking into fatigue and avoiding resonance.
 
@billy_boy

Surge loading and similar problems are not particularly difficult to deal with . Could you could just give us a clearer idea about what you are trying to design ?
 
Dan S thank you. This is the answer i was looking for. It is a very simple reaction vessel
 
billy_boy said:
How can I calculate the pressure exerted by a fluid on the walls of the vessel that is being agitated. The vessel is not pressurised. I have to calculate the resultant pressure on the walls to calculate the thickness of the vessel walls.

Where do you think is the critical areas that needs attention? In the upper or the lower part of the container?
Calculation may involve wave analysis, hydraulics and water hammer effect.
 

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